Roller grinding-mill.



H. ALLEN.

ROLLER GRINDING MIL L. APPLICATION FILED JUNE L5. 1916.

lnyentop Attorneys Patented Dec. 12, 1916.

2 SHEETS-swan 1 H. ALLEN. ROLLER GRINDING MILL. APPLICATION-FILED JUNE 15. I915.

Inventor,

Attorneys Patented Dec. 12, 1916.

2 8HEETSSHEET 2 Witnesses.

ing element.

HENRY ALLEN, 0F GAINESVILLE, FLORIDA.

ROLLER. summits-MILL Specification of Letters Patent.

Patented Dec. 12, l9f6.

Application filed June 15, 1916. Serial No. 103,753.

To all whom it may concern:

Be it known that I,HENRY ALLEN, a citizen of the United States, residing atGaines ville, in the county of Alachua and State of \Florida, have invented a new and useful Roller Grinding-Mill, of which the following is a specification.

The ob ect of the invention is to provide a simple, inexpensive and eficient grinding mill of the roller type wherein the material to be ground is conducted longitudinally or parallel with the axis of the roll or rotary element from one end to the other, so that all portions of the inding surfaces may be brought into e ective operation upon the material, and wherein the grinding elements may be readily removed, replaced, and reground or sharpened, and wherein the cooperative portions of the grinding faces may be relatively adjustable to vary the fineness of the product and the rate of grinding.

Further objects and advantages of, the invention will appear in the following description, it being understood that changes in the form, proportions and details of construction within the terms of the claims may be resorted to without departing from the spirit of the invention.

In the drawin s:-Figure 1 is a vertical sectional view 0 a mill constructed in accordance with the present invention. Fig. 2 is a sectional view at right angles to the plane of Fig. 1 on the line indicated 2-2 of Fig. 1. Fig. 3 is a face view of a bafie. Fig. 4 is a detail view of a section of the rotary grinding element.- Fig. 5 is a similar view of a section of the stationary grind- The mill essentially consists of a rotor and a stator having cooperative grinding surfaces arranged in a casing conslstmg in the construction illustrated of a head plate 10 and a tail plate 11, the grain or other material to be ground being introduced through a feed openin 12 in the former by means for example 0 a hopper 13, while the meal is discharged through an outlet 14. after having passed the length of the grinding elements. Both rotor and stator .are of sectional construction on planes transverse to the axis of the former which in the construction illustrated consists of a roll 15 carried by a shaft 17, while the latter consists of a breast or concave 18 suitably supported in the casing. The sections 19 of the roll are preferably threaded as at 20 upon the shaft, to permit of their removal and replacement or grinding and sharpening, and the serrations on said roll sections are preferably arranged diagonally with reference to the axis of the roll, to afiord a feeding action upon the material being ground, said serrations being readily filed or sharpened by any-suitable instrument when the sections have been removed from the machine. The breast orconcave consists of a series of sections or rings 21, having their inner or grinding surfaces similarly serrated to cooperate with those of the roll sections, and 'said breast or concave sections or rings are of approximately oval form as shown clearly in Flgs. 2 and 5 i to provide a feed chamber or passage 22 between the roll and the long diametered portions of said rings and in registration with the feed opening 12. Also a baflle consisting of a plate 23 may be interposed between two of the breast or concave sections, and is provided with an opening 24 approximately fitting the roll in contour, and adapted, by means hereinafter described, for adjustment to vary the extent of obstacle which it ofiers to the forward feedin movement of the materialpassing througfi the mill.

In the construction illustrated, the breast or concave sections are pivotally mounted by means of a bolt 25 within the casing, and

' 28 being provided to secure said bolt and hence the sections of the breast or concave at the desired adjustment. The movement of the bolt 26 in the frame slots serves to vary the distance between the grinding portions of the surfaces of the rotary and stationary elements of the device, and to facilitate this adjustment there is provided a strut bar 29, (one for each end of the bolt) engaged at its upper end with the bolt and engaged in turn at its lower end by a set screw 30. By the adjustment of the set screw the strut bar may be moved to either raise or lower the bolt 26 and thereby more or less incline the breast or concave sections, to vary the fineness of the product. The bafile plate is also engaged with the bolt 26 to form a pivot and is slotted as at 31 to receive the bolt 25, so that any desired adjustment of said bafie plate with relation formity of product while the various. ad-

justments provide for securing not only the desired degree of fineness but also a variation in the rate of grinding, to further add to uniform action upon the material.

What is claimed is 1. A grinding mill having a rotor and a stator constituting cooperative grinding elements, the stator having a substantially oval inner surface facing the grinding surface of the rotor, pivotally mounted eccentrically to the rotor and providing an inclosed feed passage parallel with the axis of the rotor, and means for securing the stator in its adjusted position.

2. A grinding mill having a rotor and a stator constitutmg cooperative grinding elements, said stator being of sectional construction on planes transverse to the axis of the rotor, and a baflie plate interposed between sectlons of the stator for obstructing the passage between said elements.

3.- A grinding mill having a rotor and a stator constituting cooperative grinding elements, the stator being of sectional construction on planes transverse to the axis of the rotor, a baffie plate interposed between adjacent sections of the stator for obstructing the passage between said elements, and means for securing said baflle plate in adjusted positions with reference to the sections of the stator.

4. A roller grinding mill having a shaft, a roll consisting of a series of sections removably mounted upon said shaft and provided with serrated peripheries, a breast or concave surrounding said roll and consisting of 'interiorly oval sections arranged in planes at right angles to the axis of the roll and pivotally mounted for adjustment, said breast or concave sections having serrated inner grinding faces, and means for securing said sections of the breast or con-.

cave in adjusted position.

5. A roller grinding mill having cooperating grinding elements consisting of a roll and a breast or concave, said breast or concave consisting of a series of oval sections arranged in planes transverse to the axis of the roll and surrounding the same to form strut bars engaging said bolt, set screws for adjusting the strut bars, and means for securing the parts in their adjusted positions.

In testimony that I claim the foregoing as my own, I have hereto afiixed my signature in the presence of two witnesses.

HENRY ALLEN.

Witnesses:

Row. C. BOWERS, C. S. BRANNON. 

